#include<iostream>
int main(void){
 int i = 100;
 int  & ref_i = i;
 ref_i = 101;
 std::cout<<ref_i<<" "<<i<<std::endl;

 int &&ref_ii = std::move(i);
 ref_ii = 102;
 std::cout<<ref_ii<<" "<<i<<std::endl;
 
 //右值引用
 int && ref_r_a = 200;
 std::cout<<ref_r_a<<std::endl;
 return 0;
}
